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DGS-3120 Series Managed Switch CLI Reference Guide 
551 
 
 
Restrictions 
Only Administrator, Operator and Power-User level users can issue this command. 
 
Example 
To config PoE system-wise was setting: 
deny_low_priority_port 
Command: config poe system power_limit 250 power_disconnect_method 
deny_low_priority_port 
 
Success. 
 
DGS-3120-24PC:admin# 
 
57-2  config poe ports 
Description 
This command is used to configure the PoE port settings.  
Based on 802.3af, there are 5 kinds of PD classes, class 0, class 1, class 2, and class 3. The 
power consumption ranges for them are 0.44~12.95W, 0.44~3.84W, 3.84~6.49W, 6.49~12.95W, 
and 12.95~ 29.5W, respectively.  
The five pre-defined settings are for users’ convenience: The following is the power limit applied to 
the port for these four classes. For each class, the power limit is a little more than the power 
consumption range for the class. This takes the factor of the power loss on cable into account. 
Thus, the following are the typical values defined by the chip vendor.  
Class 0: 15400mW 
Class 1: 4000mW 
Class 2: 7000mW 
Clase 3: 15400mW 
Other than these four pre-defined settings, users can directly specify any value that the chip 
supported, Normally, the minimum setting is 1000mW, and the maximum setting is 15400mW for 
802.3af and >=35000mW for 802.3at. 
 
Format 
config poe ports [all | <portlist>] { state [enable | disable] | [time_range <range_name 32> | 
clear_time_range] | priority [critical | high | low] | power_limit [class_0 | class_1 | class_2 | 
class_3 | user_define <value 1000-35000>]} 
 
Parameters 
ports - Specified the list of ports whose setting is under configuration.  
all - Specify that all the ports will be included in this configuration.